Question

Match the Column I with Column II and select the correct answer using given codes.

Column I (Number of periods)		Column II (Number of elements)
A	First period	1	14
B	Third period	2	2
C	Lanthanoids	3	8
D	Actinoids	4	4

• A. A - (2) , B - (4) , C - (1) , D - (3)
• B. A - (2) , B - (3) , C - (1) , D - (1)
• C. A - (4) , B - (2) , C - (1) , D - (3)
• D. A - (4) , B - (2) , C - (3) , D - (3)

Answer 1

Answer: (B)

The correct match is
$A\to 2;B\to 3;C\to 1,D;\to 1\text{. }$
A. First period contains 2 elements.
B. Third period contains 8 elements.
C. and
D. $14$ elements of both sixth period [from $Z=58$ to $Z=71$ ] and seventh period
[from $Z=90$ to $Z=103$ ] are known as lanthanoids and actinoids respectively.